Plasma spray technology is being widely used for the development of protective
coatings to prevent degradation of critical components working under severe conditions. Plasma
sprayed alumina–titania have many industrial applications. These coatings provide a dense and hard
surface which is resistant to abrasion, corrosion, cavitation, oxidation, and erosion. Plasma sprayed
alumina–titania coatings are regularly used for wear resistance, electrical insulation, thermal barrier
applications, etc. Alumina pre-mixed with titania powder is deposited on mild steel substances by
atmospheric plasma spraying. Microstructure of the coating is analyzed by SEM. Adhesion strength
of alumina–titania coatings are measured. The response of plasma sprayed alumina–titania coatings
to the impingement of solid particles has been presented in this study. The erosion rate is calculated
on the basis of ‘coating mass loss’. It is observed that the erosion wear rate varies with erodent dose,
angle of attack, the velocity of erodent, standoff distance, and size of the erodent. Cumulative
coating mass loss varies with time of erosion.